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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b138cb5f7170117c6868cec4d426a5d345a149d5334562654979b219b54967bd' 
  AND token = '3k7zRWEdh5I0SzK9/ljjxhj/MZjoecF9zE+zjqKLB6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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