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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cb5c50a2ef2af6fe201b01ab35b63c3b67fe8ab473941d1e2b0433f395c9e0' 
  AND token = '922shpNSEHwWWq98/InOBpjkmkdmhrgnSxrR9zkWwK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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