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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132dc9add7d11c11615a833c6adb8b18f229c4996f4ea346203792d31bc90671' 
  AND token = 'BUOQ5pR2H7mV1yeVIzM18YAFXmMq80pfs6vGoXN3V94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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