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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff1abd6419ffcce462b192f0c4960207a40a6b833b3b05aec038c7c138581a0' 
  AND token = 'ZyHz26qCphfdze4sJrlt5lyMJnQU8fMk0IZWNlriE/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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