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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b6cb232a45605635d25b5e6cd3678e6c9062cd5faf9e6f64f11bed7c6c9f0e' 
  AND token = 'k2zaSZq9kP6KffVtg2nMpzdPuo0HpvJEfKAxG25tHlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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