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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdf2e2837248dfad53c416d08a9d0b32d626117b2902af05966d8d8e27b485a' 
  AND token = 'A+V+nYbqY0KIdiVoaHnEeD1uy4ZnDyqWN2brhurvtnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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