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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640fec293861eedfac810d3f734d4d9f0df21ebea5d9e8bcda58446e9ebe0e09' 
  AND token = 'aZTEOyla6DTsXlKspGI2YWrd/U29Rd/1o4U/qZWCFt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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