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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b556f152ce040151feec3fb9328917dd6075fcfda8056e4144526e903a70b8' 
  AND token = 'lP2PiMPm33XqmoPNdw4HiHB27pHqiGFq2OElh8R5Km8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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