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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5769aa467c5500d3e143fbdc9d8d2ee0fb81258da98796b29c4061a5f5e3cec' 
  AND token = 'P5n4MtpVu5WqAJnF8joeLuLy7XAzgpXL9DmPp0i8No0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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