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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955fa19378a94afd37d6f3be851ffbbcfc0cab55d1d972a4934756c64a83a5f4' 
  AND token = '/U6RUay9/wOKXtUXp7q7lj8Qc5ulDmxIglK6colGc3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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