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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c69b717714cf7e63856133dc1b415c6bc52ac76e5ca6a1a71e9416507d16e1' 
  AND token = '5dnqyLIdbmFTDQhlTv0TEMLNk2SFq71tKbbdmAsVLvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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