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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694756e00d0a7a20ec1b1453f0928e815015669c88a7c86e7af6f56042ba2cb0' 
  AND token = 'nDuqOuGCPISAo+Flxl+mYIeIUBHOMTmjHUaLlb/ct+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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