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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d9cda98d0c5ddf1b6e4bad21e432322039f2ea0235bfbc45b3e022513a0dd4' 
  AND token = 'Sx8lBApdcoH2UNt+0zpX+SwRs9FxirFOxaPPQa21pwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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