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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e772c5e000c89cf9a849e7a8ddd8b5c52c33c4a0e1c30642858a2b1ff2dbcb' 
  AND token = 'S9La2DhGP8HnUBZuibA/ujcatFB2OHMbtPyrURZ94QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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