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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef41eec3ea3558b2bcaf767cb70459b6d2d4d8fe141f3f05261b8bfd98168544' 
  AND token = 'wlPr1mkfNVx2m8i2ry1IXNxWjAM1zuISeMw7kX13pfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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