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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08ef13d770370d901b658b31929ade6f36766a2f5cb90e23f4d1e4ee95bd754' 
  AND token = '8G1nlm++X5mgKW4qz29wNPQi8gWW7yYQrWeJAVbbKr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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