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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306810d8eaaccf27d2cc7d30bffb3acfb2e075cbf9c8cb901e4347096e6fb4fe' 
  AND token = 'i4X708g19CMrJLeEcsOMjX0C8ZLCXkkXb0sNnYS8O5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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