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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207a9591bd03ddd73b553cbae6c6ed811dbedf759009c9c3eedebee7e03d478d' 
  AND token = 'fyfT+y7CCQw1chmcAR2zrl4VoKmU39bCoT7dcn1DHVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}