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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74918bc1b7bcd5e887e98e0b50224fd3f0790866f35361ce0f802d2d3b0df65e' 
  AND token = 'Awc4LE47FbTeCC5JTNC0FeqtRXBGtt7DRYLxwaXBBx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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