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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c54d3437b5219dc17f829c18d32ee216501f5f07769958edd3b73aca4f242ae' 
  AND token = 'L9X9AJ4Iomaf4vvTYbZ8xpbGRwQV/nQwE97FG6ModAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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