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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f76a541567b5d7e0af82400bb6730e0fd3c38ca58f5817b169790dae8f02225' 
  AND token = 'fA1kl1HEpl+2AsnVlHptehACsNI4JLsH+qkKeg2qHUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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