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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8239088a84ed463c03e422bad0d45b4633ca0d5b9516178575938a44e5a93aa0' 
  AND token = 'DqH+rJJ89hpIMDTqr4iTgPIXJZ7u+SPS3JnQWCg9D9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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