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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0ace89eb5c365d7486c217cfc7ca41e1f3f001fb1de5508dbced15f70e4d7d' 
  AND token = 'k46DGFt2OozWwCu9PD+/D/ZEU2/Mgadz+gS1I2phBq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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