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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7037e435aa5fd0f4ff361aa53dfab83365ae1969e483b7d1f4724a4f131e3d' 
  AND token = '96bBPFtnzimmX4+B7N8AaWFtAag1n0Li4crR/zWhSM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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