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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48fba2284e8db40784a794119fc174419d54f6c1c8203ad208d05f3a43970186' 
  AND token = 'bVsCoIX9kP6yeTZ2KGGOlV9b5nYy6snI1A3t4OQG3q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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