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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf80c04aa417d0c8af36b4cf8b46553e77b9fee760f1b20dbfc5812a78edfa00' 
  AND token = 'BCBg875G6tK+TcKIt7hiMB6e70bveFPWNP2pnmGJLwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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