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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23990b4d6cb6a95fa4b031d368b1e40ba76b246ee00ce61bf86f5d569436c5e2' 
  AND token = 'uS2bEZKzF3EhyfWWnVbVvIaMNaLsDyu7yeQ3AoV6bKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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