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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ef376881eb9a904b3b334ef5e51a2ce08704b8c973c7eec27c867ab9ddf83e' 
  AND token = 'NSMWpmCcUwINBcNyNyXdu8E4H9HB16ASjS5L+ZDuyBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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