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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eebc496f6f49de6dd1f55aac355e602f7678df19085909c8f73bcef1e694ae1' 
  AND token = 'Qa0ftBoVsx6Z4++TDhdLTiN4s2dJszQV/Pynd8XLn/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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