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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9ca6dfea8941b88c0d8ec48625a4a77c90993d3ae0a98d1c6e665425621f90' 
  AND token = 'ItKQHhJkhGkpLWZj38CrISxRYLh7mu2XLD2xfWDY8mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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