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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26db905252383978d0096fcff8855a00b6d7e86e07656408b2841908cf5b5db7' 
  AND token = 'TMtl23xzBqorGhZz3REXR59qn6j2pC5iNEM+Y+kSF88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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