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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94402485fd4d9ba9fb5536fd7b030e64a5a67d8bf5dfe1de74a0cd2776b6c3d5' 
  AND token = 'TzAzIinmlzR0xQU8pkSUeUHCjAP+8qulqow+pmzzDkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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