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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c9c66a4b5f3021afa9a4df89933796ab324abcaa2d6a539df3669cc41bf9a7' 
  AND token = 'iHPveSQaxlDVGObsQ52KaCBOPYEjG5wSx9DqYJk1uwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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