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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97ad144c7dbaf68c0d3f02461eb0c75e58041bc5603311219dcd9c8d43289b2' 
  AND token = 'hluqF+8brtVxcipn+bv0Fkoy075PlDio0zpyaGDwVP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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