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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7cc5ebce3a1d35f79896e1da8b9bb58b7603e11d3b3433f15640cca97aaeb76' 
  AND token = '7vdaw54LhthxWgGyM255mcouLSGw7mb7hbwULkHRcHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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