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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be51aa4a4855d6d93d8252646b24407f2d49ef144bf8c78abd6f0370171ecf28' 
  AND token = 'X8j0pOiJxXiG8dwaJdXJexwrJdMJzckdh4bzjPZkRaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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