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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7806a143be026f462e8033cec2f5c19ca7606dac632ee9532ea1dcb63b62f109' 
  AND token = '4+pudb+HCSI9oJClXAGS1R+Sdu5UWOI9oXcYjiFAdDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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