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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb523dacc0ff2d580f25b658e751d129ce1685f3747d3e89596e7f03c7918630' 
  AND token = 'v3sGMukWFHaxLJpq38mvxz1TQvmdzuM/C0o/93dnrqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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