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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9375bac27a46efc634e1e2809b96e134c4ab9b1d910c127c8a0f492949708a0d' 
  AND token = 'szE6u6v8FXdYy4N4D64iCQ7qYfA7NWOEmnE2Y4ukNEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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