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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0594e63806ddbbeba317bfa3855250262c8bc44de4d09c7d0f3de321f1344085' 
  AND token = 'zARt3oVEsJcTQ6jwhRCTrJ0PqESF2VAc/RH85QnUQMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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