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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8e691a96f6f9f2be0ae0b52175e5caab39309cc79c26a1c74adb93a1a9ace6' 
  AND token = 'quq/wR50RbLJh2j/G4cP/N2OgzzXO0EixtZobjtVD9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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