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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dc8d08c10333f24e84b04d8d9a5112f53d2afa64c9524552197540adcb22b2' 
  AND token = '9np1PfnfZuJCDWIyo6CssoWBLEC8bn/+iw8V2NnW2WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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