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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c96f58f8852eddfeb6097209e12a29260ddbfc669d614f0afc3096ab3a92d0' 
  AND token = '8P+dc9/8feYy25HqBMZrGvbYmdtqBng/9HYZ7XRlXS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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