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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b2896f8aebc1c2012fafebe9aeed808ed728061a12368ea1f0b5ad096f1b5d' 
  AND token = '88nli8Cu2LzObIxDhk9Ts4/KuIx7i/nk80rTjFJpRuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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