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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c8577cec7825f324a97171b191836a1eceeb2fd4b3401597039d7639dc767d' 
  AND token = 'irAVJ9r5glZUz74Hr6JX9BseHB+ffjRWbfMogNuc8WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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