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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bda2ee1974e3f7c51a376481740500ea8f1eb7a20b19f2889b028d3978c70eb' 
  AND token = 'Fl3AKwRP6cItszX0/jADkV47KQFaNoxfT4kFuI+sop4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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