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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bb95ef056d1ef4971bf8ac986ad03378ee8ad11179f0b85a7bd763f420b438' 
  AND token = 'aWHocLrQywL/iCp216LTOGBiRYb5Nb20ErvCLpiI31Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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