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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7be041c09af5739e987bfc3f2296f4e15ae48e4d205d9d5c52b01751a5e20a0' 
  AND token = 'qzqOrkkDdqKow0Y9vLy5VU6aqjOH1H4gHFRr9dUPqGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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