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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3825c27f5ea1018030de10c85bab9e631f53ccffa6fd11b62d48cf7f5a47ef7' 
  AND token = 'He3+/KehVKtFPBznWzQM8VAW33IfTFFan1JqSIrzJi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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