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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b181c224994854297c457aad5ad82da5b830b0ea44433e534c9274b3a59bc45' 
  AND token = 'y388CGIJ77bavuoP72F5zlpwJzryxTMpGooAP/So9p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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