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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385c37356bf80766af9265339588a16827952302926e25f1c15ef903aed4d3c5' 
  AND token = 'LK2o2NcdfDRimUcSL3ftk0f1wMRQAsTSr1pIKEf+QS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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