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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b657ae631a02f35f8970709ac445235099b9745ae32a2a20e4eaa3d726b90dd' 
  AND token = '+rF3AAE25+dmUnI2iZZ70+VDhomw9mcdCUofLgR4BcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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