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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e29c7c31002cd10ca05b4e5310831785256a41d24e04ba583b3c4d33209fd5' 
  AND token = 'NcCWmKakw2Iqq7LkPmd3/bsBPd7xpqALO/jUywcBhws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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