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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ada51c760528174b05f76d273b77f754c27a5315f588d20fac40d08a60f06b' 
  AND token = 'y2zR0pEvGfeF4QAaN0BRWFGsUcGqqy35r0OUXtgIadg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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