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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755c6c3daa2be25570ceeca3bf253a306b600aab61ee9161b3856c3f65126955' 
  AND token = 'OXHzEU3EDLDAT4yuUs/Ypi49D6A58Q0fBajMBX5rTDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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