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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addf15c87280eb65ffb662e6b6e496e575368b5e934875fcd0e8ec7e4bcb6f6e' 
  AND token = '/mcMkcos3A25nvTBB8658j7TF6t2W7zDsFw0JDfF80c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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