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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb554279709eab22e7921908f9d06e23e81ca34b681b0a7bca2595eba58684a' 
  AND token = 'o+ctVDR4fa10tnCITuRfHny11SHwXjXl8a68qCC0nFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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