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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae85fa3bb5ad606fce0040b44301727c52f747856350a171d60b98aa64d57d6' 
  AND token = 'qfaTlxcy95DWysJ6Rn1f5xI9DvyARJMb4VOgeOVww8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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