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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2088755887083d1a9ebe362afa16a23c7bf88180e6ad688b6404a387a8a1c3bb' 
  AND token = 'sa/2sPYldy/s1LfYazyFGzmUAgF+/bhRRs6hRt6BfqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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