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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29e4426a67b348eff7e7062119e36c5ca497f051d40855e6ca9a76d682af3b7' 
  AND token = 'LKuu6CUK6gsY8QKTdQMKNQww3LGfEgk+xM3eCI/JCFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00201

JSON explain

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