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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c67e507b18c28f1b183fc4c33a3085cd6b9e25a5a38ac522262d0f919629e8' 
  AND token = 'jrR1oav77EkkfibqoOBDTyHISkg2c7ukxKPVwRmmFw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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