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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d751112d3d3a29c573c25c9fe43f031a130ce4bd30d1657c4a03b2ec968853' 
  AND token = '9M4SJfBMEWZOMVhk72vm+xIhd0Uc+HjsyidM1IpLst0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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